Air has
a. a fixed volume but no fixed shape.
b. no fixed volume or shape.
c. a fixed shape but no fixed volume.
d. both a fixed shape and fixed volume.

The meselson-stahl experiment demonstrated that dna replication is semiconservative. in the figure, semiconservative replication is illustrated by

Growth of chest hair, deepening of the voice, and muscle growth are secondary sex characteristics. which most likely affects the development of these traits? testes ovaries prostate gland vulva

Which of the following is an advantage of solar energy?